Feed-actuating mechanism for sewing-machines.



. M. SANDT. I FEED ACTUATING MECHANISM FOR SEWING MACHINES.

APPLICATION FILED OUT. 19, 1912.

1,118,059. Patented Nov. 24, 1914.

lnven/or: w s Max.

THE NORRIS PETERS 60.. PHOTO-LITHO. WASHING rON. D. C.

UNITED STATES PATENT. OFFICE.

MAX SANDT, or IBIELEFELD, GERMANY, Assren'on T FIRM BIELEFELDER Mason-.

NENFABRIK VORMALS DURKOPP & COi, BIELE'FELD, OF BI ELEF ELD,

GERMANY.

FEED-ACTUATING MECHANISM ronsEWI NG-MAcHrnEs.

To all whom it may concern:

Be it known that I, MAX SANDT, a citizen of the Empire of Germany,residing at Kaiserstrasse 165, Bielefeld, Germany, have 5 inventedcertain new and useful Improvements in F eed-Actuating Mechanism forSewing-Machines; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

For the setting or adjusting devices for the feed mechanism of sewingmachines as hitherto constructed lever mechanisms of many differentdescriptions have been employed located in the casing of the machine andactuated from the shaft in connection with the arm.

According to the present invention the whole of these intermediate partsare dispensed with: all the parts for controlling the variations inlength of the stitch being located in the simplest manner upon andaround the shaft in connection with the arm. 1

The invention is illustrated on the accompanying drawing in which Figure1 is a vertical section taken at right angles to the shaft in connectionwith the arm; Fig. 2 is a view partly in section in the longitudinaldirection of the shaft in connection with the arm.

I) is an eccentric mounted on the shaft a in connection with the arm.This eccentric works in a sliding block 0. The block 0 in turn works ina guideway c with parallel sides formed in the head (Z of the actuatingrod. At the other side the head of the actuating rod is formed with acylindrical 4 boss 0 which in turn works in a guideway 6 with parallelsides formed in a part f located in the casing of the machine and.centrally disposed with respect to the shaft .11. Attached to the partf provided with the guideway e is a setting handle 9 by means of whichit is possible to fix the part f in the desired position.

The operation is as follows :-Beneath the plate of the sewing machineare located, in a known manner, the pushing or rocking spindles fortransmitting the movements to the feed. The actuating rod (Z operatesone of these spindles. As soon as the eccentric b on the shaft inconnection with the arm is set in motion, it communicates Specificationof Letters Patent. Patent d NOV 24 1914 Application filed. October 19,1912. serial No; 726,708. a

a backward and forward movement to the actuatmg rodrZ and the head (5 ofthe gulde rod, whlle the sliding block 0 moves -up and down in theguideway with parallel sides located in the rod. v

If the part f provided with the guideway e is so set that the planepassing through its middle line is perpendicular to the plane 0Z passingthrough the axis of the actua-t-' mg rod (Z it is obvious that nomovement is communicated to the transmission shafts or spindles locatedat the lower part of the machine casing all that is produced is a Irocking movement around the point where the actuating rod al is jointedto the feed rollers. If now the part f with its parallel guideway e ismoved by means of the setting screw 9 so as to bring the middle line eof the path into some angular position which is greater orsmaller than90, the result is that in addition to the swinging motion of'theboss-like projection e on the head (Z of the actuating rod, theinclination head of the actuating 60 of the guidewaye causes theactuating rod (Z and the head thereof to have an up and down movementdepending upon the angle. The smaller the angle becomes starting from 90the greater is the upward and downward movement of the actuating rod (Zand the greater the movement trans- I mitted to the feed mechanism, thatis to say the length of the stitch depends upon the angle. If theadjusting screw 9 is set above the neutral line, where no motion istransmitted, the feed mechanism moves in the forward direction, but ifthe setting screw is turned through the neutral line and to some lowerposition a reversal of the direction of motion is the result and thedevice moves backward.

What I claim and desire to secure by Let? ters Patent of the UnitedStates of America 1s 1. In a device of the type described thecombination of a casing, a shaft rotatably mounted in said casing aguide way centrally and rotatably mounted on said shaft, a feedactuating-rod having an opening in the head thereof, larger than saidshaft and through which said shaft extends, a boss on one side of saidhead adapted to coact with said guideway, an eccentric secured to theshaft, a guideway formed on the opposite side of said head in which saideccentric 110 operates and means for adjusting the inclination of saidfirst mentioned guideway.

2. In a device of the class'set forth the combination of a shaft, aneccentric mounted on said shaft, an actuating rod for the feed providedwith a head formed on one side with a guideway for said eccentric and onthe other side with a circular boss, located substantiallyconcentrically with respect to the shaft, a second guideway inconnection. With the casing for the reception of the aforesaid boss andmounted loosely around the said shaft, and means for adjusting theinclination of said second guideway as and for the purpose set forth.

In testimony whereof, I affiX my signature, in presence of twoWitnesses.

MAX SANDT.

Witnesses:

FRANK A. PUTNAM, VVILLY ARIDLY.

Uopies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, i Washington. I). C.

